There is such a device, it is called a clue stick. Unfortunately you have to be very close to apply the clue with one. Bit hard to reach all the way to China with it.
I've just been checking in case I'd accidentally marked one of my own posts as spam - I did trawl through the everbuying thread last night to do my bit for spam weeding. I did find one post that was from a spammer but wasn't in itself spam which i had marked as spam. But apparently I didn't mark my only post in there as spam. My score was zero about 3hr ago. I think.
I should be able to, but that feature is not working for some reason at the moment. But don't forget, 31+ day users with more than 15 posts are immune to blocking, so no worries. ;)